SILK-WORMS. 
253 
disordered, and the impregnating liquid of the 
male is weakened by admixture with this abund- 
ance of liquid matter in the female; consequently 
the impregnation is imperfect, which produces the 
same effect as when they are unimpregnated. 
3. When the space where the eggs are hatch- 
ed is too damp, they cannot dry sufficiently, the 
evaporation of moisture not being free. 
The stagnation of this dampness more or less 
affects the embryo, and engenders diseases analo- 
gous to those I have already mentioned. 
4. When the place where the eggs were kept 
and preserved has been damp, the embryo will 
suffer being kept in a medium which does not allow 
of the slow and gentle evaporation of the matter 
contained in the shell, by which it insensibly at- 
tains the state assigned to it by nature. 
5. When the eggs are too thickly heaped to- 
gether, in which case, although the place be dry, 
the transpiration of the eggs will be intercepted, 
as also the even contact of the air, the eggs heat, 
and are affected even at a low temperature ; conse- 
quently the embryo may be injured by any of 
these causes. 
No disease will occur, — 
1. If the temperature of the place where the 
moths are kept be maintained between 68° 
and 75°. 
2. When the apartments are dry. 
